CN203761017U - Short circuit current protection device of motor protector - Google Patents
Short circuit current protection device of motor protector Download PDFInfo
- Publication number
- CN203761017U CN203761017U CN201420099803.2U CN201420099803U CN203761017U CN 203761017 U CN203761017 U CN 203761017U CN 201420099803 U CN201420099803 U CN 201420099803U CN 203761017 U CN203761017 U CN 203761017U
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- Prior art keywords
- circuit
- short circuit
- motor protector
- signal conditioning
- protective device
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- Expired - Lifetime
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- 230000001012 protector Effects 0.000 title claims abstract description 27
- 238000004088 simulation Methods 0.000 claims abstract description 28
- 230000003750 conditioning effect Effects 0.000 claims abstract description 24
- 230000001681 protective effect Effects 0.000 claims description 22
- 230000001143 conditioned effect Effects 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 9
- 238000002679 ablation Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a short circuit protection device of a motor protector and belongs to the overload protection device field. The utility model discloses the short circuit protection device of the motor protector. The device comprises a mutual inductor connected to a power grid and a signal conditioning circuit connected to the mutual inductor. An output terminal of the signal conditioning circuit is connected to a single-chip microcomputer. The single-chip microcomputer is connected to an execution mechanism. A simulation trip circuit is also included. An input terminal of the simulation trip circuit is connected to a plurality of conditioning signal output terminals of the signal conditioning circuit. An output terminal of the simulation trip circuit is connected to the execution mechanism. Through adding the simulation trip circuit, break time is short so that ablation time of a circuit breaker contact is shortened. The simulation trip circuit can completely replace an effect of a backup electromagnet. Space is saved for the motor protector and the device is safe and reliable.
Description
Technical field
The utility model relates to a kind of overload protection arrangement, relates in particular to a kind of short circuit current protective device of motor protector.
Background technology
The effect of motor protector (having another name called motor protector) is comprehensively to protect to motor; in the time there is overtime startup, overcurrent, undercurrent, disconnected phase, stall, short circuit, overvoltage, under-voltage, electric leakage (ground connection), three-phase imbalance, overheated, bearing wear, rotor bias, external fault, incoming call self-starting, inverse time lag in motor, the device of being reported to the police or protecting.
Fig. 1 is the circuit diagram of existing short circuit current protection, refer to Fig. 1, current for the overcurrent protection of power transmission and distribution system, the motor protector in the fields such as motor overload protection, comprise an instrument transformer 11, one signal conditioning circuit 12, one single-chip microcomputer 13, one actuator 14 and power supply 15, wherein, instrument transformer 11 is by the forceful electric power signal IA of electrical network electric wire, IB, IC, IN becomes the receptible weak electric signal ia of microprocessor, ib, ic, in, enter single-chip microcomputer 13 by signal conditioning circuit 12 again, it is carried out to signal sampling, process, the steps such as judgement, if sampled value is greater than set point, pushing executing mechanism 14 moves.
This protection structure from detect fault again to whole mechanism disjunction fault generally 36 ~ 49ms, this break-time can meet the demands completely in the time of little electric current.But; in the time there is short circuit (electric current reaches 15 times of rated current and is considered to short circuit current) in electrical network; circuit heating is serious; protected equipment heating is too high; protective device ablation is serious, the lost of life; sometimes even because the excessive disturbing magnetic field of electric current is excessively strong, there is misaction and cannot play a protective role.
Therefore, current motor protector often needs external standby electromagnet to complete large electric current disjunction, but the shortcoming of standby electromagnet is: 1, take up room large; 2, break-time is long, and the wild effect such as has repeatedly deciliter.
Utility model content
The utility model discloses a kind of short circuit current protective device of motor protector, large in order to taking up room of solving that the external standby electromagnet of motor protector in prior art completes that large electric current disjunction causes, break-time long and the wild effect such as repeatedly deciliter.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
A kind of short circuit current protective device of motor protector; comprise an instrument transformer being connected with electrical network; one signal conditioning circuit is connected with described instrument transformer; the output of described signal conditioning circuit is connected with a single-chip microcomputer; described single-chip microcomputer is connected with an actuator, wherein, also comprises a simulation trip circuit; the input of described simulation trip circuit is connected with multiple conditioned signal outputs of described signal conditioning circuit, and the output of described simulation trip circuit is connected with described actuator.
Short circuit current protective device as above, wherein, described simulation trip circuit comprises: multiple amplifying circuits, the input correspondence of described multiple amplifying circuits is connected with described multiple conditioned signal outputs of described signal conditioning circuit; One comparison circuit, described comparison circuit has that a comparison circuit input, a comparison circuit are relatively held, a comparison circuit output, described comparison circuit input is connected with the output of described multiple amplifying circuits, described comparison circuit is relatively held with a reference signal and is connected, and described comparison circuit output is connected with described actuator.
Short circuit current protective device as above, wherein, also comprises a power supply, and the input of described power supply is connected with described signal conditioning circuit, and the output of described power supply is connected with described actuator and described single-chip microcomputer respectively.
Short circuit current protective device as above, wherein, is equipped with isolation components and parts between amplifying circuit and described comparison circuit described in each.
Short circuit current protective device as above, wherein, described isolation components and parts are diode.
Short circuit current protective device as above, wherein, the voltage of described reference signal is 2.0V ~ 2.5V.
In sum; owing to having adopted technique scheme; taking up room that the utility model has solved that the external standby electromagnet of motor protector in prior art completes that large electric current disjunction causes is large; break-time long and the wild effect such as repeatedly deciliter; the utility model is simulated trip circuit by increase and is made break-time shorter; shorten the ablation time of contact of breaker; simulation trip circuit of the present utility model can replace the effect of standby electromagnet completely; for motor protector has been saved space, and safe and reliable.
Brief description of the drawings
Fig. 1 is the circuit diagram of the short circuit current protection of existing a kind of motor protector;
Fig. 2 is the circuit diagram of the short circuit current protective device of the utility model motor protector;
Fig. 3 is the simulation trip circuit figure of the short circuit current protective device of the utility model motor protector.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further:
Fig. 2 is the circuit diagram of the short circuit current protective device of the utility model motor protector, refer to Fig. 2, a kind of short circuit current protective device of motor protector, comprise an instrument transformer being connected with electrical network, one signal conditioning circuit 22 is connected with instrument transformer 21, the output of signal conditioning circuit 22 is connected with a single-chip microcomputer 23, single-chip microcomputer 23 is connected with an actuator 24, instrument transformer 21 is by each phase heavy current signal IA of electrical network electric wire, IB, IC, IN becomes the receptible weak electric signal of single-chip microcomputer 23, carry out demodulation by signal conditioning circuit 22 again, the process of conditioning comprises full-wave rectification and High frequency filter etc., to obtain comparatively good signal waveform, process full-wave rectification and filtered conditioned signal SignalA, SignalB, SignalC, SignalN, can be power supply 25 circuit supplies, using the power supply as single-chip microcomputer 23 and actuator 24, wherein, also comprise a simulation trip circuit 26, the simulation input of trip circuit 26 and multiple conditioned signal outputs of signal conditioning circuit 22 are connected, and the output of simulation trip circuit 26 is connected with actuator 24.
Conditioned signal SignalA, the SignalB of modulate circuit of the present utility model, SignalC, SignalN export single-chip microcomputer 23 to, signal after conditioning is carried out to the steps such as AD sampling, processing, judgement, if sampled value is greater than set point, drive actuator 24 to move, otherwise, do not carry out any action.
Fig. 3 is the simulation trip circuit figure of the short circuit current protective device of the utility model motor protector, refer to Fig. 3, simulation trip circuit 26 of the present utility model comprises: multiple amplifying circuits, and the input correspondence of multiple amplifying circuits is connected with multiple conditioned signal outputs of signal conditioning circuit 22; One comparison circuit, comparison circuit has that a comparison circuit input, a comparison circuit are relatively held, a comparison circuit output, comparison circuit input is connected with the output of multiple amplifying circuits, comparison circuit is relatively held with a reference signal and is connected, and comparison circuit output is connected with actuator 24.The voltage of reference signal of the present utility model is 2.0V ~ 2.5V, only the voltage higher than 2.0V is directly processed.
The utility model also comprises a power supply 25, and the input of power supply 25 is connected with signal conditioning circuit 22, and the output of power supply 25 is connected with actuator 24 and single-chip microcomputer 23 respectively.
Between each amplifying circuit of the present utility model and comparison circuit, be equipped with isolation components and parts.Isolation components and parts of the present utility model are diode.
Fig. 3 is the simulation trip circuit figure of the short circuit current protective device of the utility model motor protector; refer to Fig. 3, in an embodiment of the present utility model: conditioned signal SignalA, the SignalB of modulate circuit of the present utility model, SignalC, SignalN export simulation trip circuit 26 to.Simulation trip circuit 26 further comprises and is respectively used to amplify four amplifying circuits 261 ~ 264 of conditioned signal SignalA, SignalB, SignalC, SignalN, four diode D1 ~ D4 and comparison circuits 265.Wherein, four diodes are as isolation components and parts, and major function is that four signal SignalA, SignalB, SignalC, SignalN are isolated.Four amplifying circuits 261 ~ 264 are made up of amplifier U1A ~ U1D, resistance R 1 ~ R12.And comparison circuit 265 comprises a comparator U2B, its input, through resistance R 15, connects the output of diode D1 ~ D4, and it is relatively held and connects a reference voltage V f who is formed by resistance R 16, R17 and 2.5V voltage.Comparator U2B output connects actuator 24, to drive actuator 24 to carry out relevant action.
In specific implementation process of the present utility model: when fault current hour, the input voltage of comparison circuit 265 is less than reference voltage V f, therefore simulate trip circuit 26 and be failure to actuate (output low level), and single-chip microcomputer 23 determines whether to move according to preset value.And in the time there is catastrophe failure, instrument transformer 21 is exported large fault current and is entered single-chip microcomputer 23 and simulation trip circuit 26.In simulation trip circuit 26; this current signal quilt and reference voltage signal Vf compare; if the current failure signal of any phase is greater than reference voltage signal Vf in A, B, C, N; simulate trip circuit 26 and send disjunction order (output high level) to actuator 24 at once; impel its disjunction motor protector; and do not need to process by microprocessor, thereby shorten the time that fault continues, reduce the break-time of circuit breaker in short circuit current situation.Confirm through test, adopt simulation trip circuit 26, in the time there is large current failure, break-time, between 9ms ~ 12ms, has shortened the time of fault continuity greatly.The utility model, compared with standby electromagnet, adopts the design of simulation trip circuit 26, has shortened the contact of breaker ablation time, and can replace the effect of standby electromagnet completely, for motor protector has been saved space.
In sum; owing to having adopted technique scheme; taking up room that the utility model has solved that the external standby electromagnet of motor protector in prior art completes that large electric current disjunction causes is large; break-time long and the wild effect such as repeatedly deciliter; the utility model is simulated trip circuit by increase and is made break-time shorter; shorten the ablation time of contact of breaker; simulation trip circuit of the present utility model can replace the effect of standby electromagnet completely; for motor protector has been saved space, and safe and reliable.
Claims (6)
1. the short circuit current protective device of a motor protector; comprise an instrument transformer being connected with electrical network; one signal conditioning circuit is connected with described instrument transformer; the output of described signal conditioning circuit is connected with a single-chip microcomputer; described single-chip microcomputer is connected with an actuator; it is characterized in that; also comprise a simulation trip circuit; the input of described simulation trip circuit is connected with multiple conditioned signal outputs of described signal conditioning circuit, and the output of described simulation trip circuit is connected with described actuator.
2. short circuit current protective device according to claim 1, it is characterized in that, described simulation trip circuit comprises: multiple amplifying circuits, and the input correspondence of described multiple amplifying circuits is connected with described multiple conditioned signal outputs of described signal conditioning circuit; One comparison circuit, described comparison circuit has that a comparison circuit input, a comparison circuit are relatively held, a comparison circuit output, described comparison circuit input is connected with the output of described multiple amplifying circuits, described comparison circuit is relatively held with a reference signal and is connected, and described comparison circuit output is connected with described actuator.
3. short circuit current protective device according to claim 1, is characterized in that, also comprises a power supply, and the input of described power supply is connected with described signal conditioning circuit, and the output of described power supply is connected with described actuator and described single-chip microcomputer respectively.
4. short circuit current protective device according to claim 2, is characterized in that, is equipped with isolation components and parts described in each between amplifying circuit and described comparison circuit.
5. short circuit current protective device according to claim 4, is characterized in that, described isolation components and parts are diode.
6. short circuit current protective device according to claim 2, is characterized in that, the voltage of described reference signal is 2.0V ~ 2.5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420099803.2U CN203761017U (en) | 2014-03-06 | 2014-03-06 | Short circuit current protection device of motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420099803.2U CN203761017U (en) | 2014-03-06 | 2014-03-06 | Short circuit current protection device of motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203761017U true CN203761017U (en) | 2014-08-06 |
Family
ID=51256254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420099803.2U Expired - Lifetime CN203761017U (en) | 2014-03-06 | 2014-03-06 | Short circuit current protection device of motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203761017U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374419A (en) * | 2016-11-11 | 2017-02-01 | 马鞍山钢铁股份有限公司 | Method for rapidly cutting off short circuit current in metallurgy power supply network |
-
2014
- 2014-03-06 CN CN201420099803.2U patent/CN203761017U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374419A (en) * | 2016-11-11 | 2017-02-01 | 马鞍山钢铁股份有限公司 | Method for rapidly cutting off short circuit current in metallurgy power supply network |
| CN106374419B (en) * | 2016-11-11 | 2018-10-23 | 马鞍山钢铁股份有限公司 | A kind of method that metallurgy supply network quickly cuts off short circuit current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 200131 Shanghai city Pudong New Area Free Trade Zone No. 69 Building No. 16 Xiya Road 2 parts of E Co-patentee after: Wu Rui Patentee after: GARBSEN ELECTRIC (SHANGHAI) Co.,Ltd. Address before: 200131 Shanghai City, Pudong New Area Chinese (Shanghai) free trade zone Xiya Road No. 33 2 parts of H Co-patentee before: Wu Rui Patentee before: SHANGHAI GARBSEN ELECTRIC Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140806 |
|
| CX01 | Expiry of patent term |